Samsung devices updated to Android 12 may experience this problem
According to Microsoft, the access problem is caused by the update to Android 12, which causes some apps to lose access to certificates assigned and deployed before the update, thus prohibiting users from using the apps. Devices with certificates enrolled after upgrading to Android 12 are not affected.
Although Microsoft and Samsung are currently working on a fix, Microsoft has provided two workarounds for the access issue on itsWorkaround for the AnyConnect VPN app certificate issue Users of the AnyConnect VPN app will see a prompt saying that the app can't find the client certificate needed for the connection and that a valid certificate needs to be chosen. To resolve the issue, Microsoft suggests clearing the app's data cache.
To clear the AnyConnect VPN app's data cache, go to Settings > Work Profile > Apps. In the Apps menu, select the AnyConnect VPN app, then Storage > Clear Data. After you have cleared the data cache, open the AnyConnect VPN app. Upon opening, the app will display a popup prompt requesting certificates. To resolve the issue, choose the certificate.Upon opening the Gmail app, users will be asked to select a certificate. When users select the certificate, the app will display the error message"Can't reach server." According to Microsoft, there are two ways to resolve the issue.